Description

The ABB F204A-63/0.3 is a 4-pole Type A residual current circuit breaker rated at 63 A with a 300 mA sensitivity, designed for selective protection in three-phase electrical distribution systems where discrimination between upstream and downstream RCCBs is required. The 300 mA sensitivity threshold makes this device appropriate for fire protection against persistent low-level earth faults rather than for personal protection directly, and it is commonly installed as the main upstream RCCB in a selectivity scheme where downstream 30 mA devices protect final circuits. The Type A classification ensures sensitivity to both AC and pulsating DC leakage currents.

Manufactured to IEC 61008-1 and EN 61008-1, the F204A-63/0.3 is designed for 4-pole DIN rail installation in switchboards and main distribution boards. Its 300 mA threshold enables it to remain stable during momentary earth leakage events on downstream circuits while still responding to sustained or high-level earth faults, thus maintaining supply continuity under nuisance tripping conditions that might otherwise affect a 30 mA device at the main board level. This selective approach is required by many national wiring regulations for installations with multiple downstream RCCB-protected circuits.

Part of ABB’s System pro M compact range, the F204A-63/0.3 integrates with ABB’s modular protective device family in standard DIN rail boards. It is widely used in commercial and industrial distribution systems, multi-tenant buildings, and complex electrical installations where protection selectivity is an important design requirement. Electrical system designers, panel builders, and electrical contractors will find this device an essential component in distribution board designs that must satisfy both selectivity and residual current protection requirements in compliance with IEC 60364 and national regulations.